<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			#a{
				margin: 50px;
				width: 100px; height: 100px;
				background-color: orange;
				transition: .5s;
			}
			#a:hover{
				border-radius: 75px;
				background-color: pink;
				box-shadow: 0 0 5px 0 gray;
				width: 150px; height: 150px;
				opacity: 0.5;
			}

		</style>
	</head>
	<body>
		<div id="a">
			
		</div>
		<div id="b"></div>
		<div id="c"></div>
		<div id="d"></div>
		<div id="e"></div>
	</body>
</html>
